Overview | Back pain is a big problem for many people: According to the American Association of Neurological Surgeons, 75 to 85 percent of Americans will experience back pain during their lifetimes. Many cases are because of stress and strain, says as Gunnar Andersson, M.D., professor and chairman emeritus of the Department of Orthopedic Surgery at Rush University Medical Center in Chicago. But if you’re also doing exercises that stress your back due to improper technique, back pain is even more likely to occur. So make sure to check your form on the following popular exercises — some of which are...